Answer
26.3 Liters
Work Step by Step
We have 1.5 moles and 1.25 atm and a temperature of -6C. First we convert from C to Kelvin by adding 273 so we have 267K. Then we use:
PV = nRT and solve for V so V = nRT / P
V = 1.5 moles * 0.0821 * 267 K / 1.25 atm = 26.3 Liters